package com.sfd.security.shiro.filter;

import com.sfd.core.constant.CommonConstant;
import com.sfd.security.shiro.JwtToken;
import lombok.extern.slf4j.Slf4j;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.web.filter.authc.BasicHttpAuthenticationFilter;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * jwt 拦截器
 *
 * @author haden
 * @date 2022/8/14 17:09
 **/
@Slf4j
public class JwtFilter extends BasicHttpAuthenticationFilter {
    /**
     * 执行登录认证
     *
     * @param request
     * @param response
     * @param mappedValue
     * @return
     */
    @Override
    protected boolean isAccessAllowed(ServletRequest request, ServletResponse response, Object mappedValue) {
        try {
            executeLogin(request, response);
            //全局异常无法捕获 filter中的错误,从这里开始转发给errController;
        } catch (AuthenticationException e) {
            response401(request, response, e.getMessage());
        } catch (Exception e) {
            response401(request, response, e.getMessage());
            throw new AuthenticationException("Token失效，请重新登录", e);
        }

        return true;
    }

    private void response401(ServletRequest request, ServletResponse response, String msg) {
        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
        HttpServletResponse httpServletResponse = (HttpServletResponse) response;
        try {
            // //请求转发401controller
            httpServletRequest.getRequestDispatcher("/error?msg=" + msg).forward(request, response);
        } catch (ServletException | IOException e) {
            e.printStackTrace();
        }
    }

    /**
     *
     */
    @Override
    protected boolean executeLogin(ServletRequest request, ServletResponse response) throws Exception {
        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
        String token = httpServletRequest.getHeader(CommonConstant.ACCESS_TOKEN_KEY);
        // update-begin--Author:lvdandan Date:20210105 for：JT-355 OA聊天添加token验证，获取token参数
        if (token == null) {
            token = httpServletRequest.getParameter("token");
        }
        // update-end--Author:lvdandan Date:20210105 for：JT-355 OA聊天添加token验证，获取token参数

        JwtToken jwtToken = new JwtToken(token);
        // 提交给realm进行登入，如果错误他会抛出异常并被捕获
        getSubject(request, response).login(jwtToken);
        // 如果没有抛出异常则代表登入成功，返回true
        return true;
    }

    /**
     * 对跨域提供支持
     */
    @Override
    protected boolean preHandle(ServletRequest request, ServletResponse response) throws Exception {
        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
        HttpServletResponse httpServletResponse = (HttpServletResponse) response;
        httpServletResponse.setHeader("Access-control-Allow-Origin", httpServletRequest.getHeader("Origin"));
        httpServletResponse.setHeader("Access-Control-Allow-Methods", "GET,POST,OPTIONS,PUT,DELETE");
        httpServletResponse.setHeader("Access-Control-Allow-Headers", httpServletRequest.getHeader("Access-Control-Request-Headers"));
        httpServletResponse.setHeader("Access-Control-Allow-Credentials", "true");
        // 跨域时会首先发送一个option请求，这里我们给option请求直接返回正常状态
        if (httpServletRequest.getMethod().equals(RequestMethod.OPTIONS.name())) {
            httpServletResponse.setStatus(HttpStatus.OK.value());
            return false;
        }
        return super.preHandle(request, response);
    }
}
